Abstract
During major runoff events when most soil loss occurs, runoff is likely to dominate the rainfall-driven erosionprocesses. Thus accurate estimation of the runoff rate is critical to soil loss predictions. At plot scale, the Green-Amptinfiltration model is commonly assumed to be able to describe the temporal variation of the infiltration rate over a stormevent. Field measurements of both rainfall intensity and runoff rate at 1-min intervals at six sites in the tropical and subtropicalregions of Australia and Southeast Asia, however, strongly suggest that the apparent infiltration rate is closelyrelated to the rainfall intensity and it is essentially independent of the cumulative infiltration amount, features not accordwith the Green-Ampt infiltration equation. Furthermore, the storage effect and runoff rate attenuation are not negligibleat the plot scale. With an initial infiltration amount to determine when runoff begins, an exponential distribution todescribe the spatial variation in the maximum infiltration rate and a linear storage formulation to model the lag betweenrunoff and rainfall, we were able to develop a satisfactory three-parameter model for the runoff rate at 1-min intervalswithin a storm event.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
